Organic EL Display Pixel Layout Area Reduction via Integrated Capacitor
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Solution Overview
Problem
The existing organic EL display devices require significant layout areas for capacitance elements, which hinders the formation of higher-definition displays due to the need for multiple capacitance components per pixel.
Innovation Solution
The configuration includes forming a capacitor between the electrodes of the organic EL element in a region that does not contribute to light emission, utilizing this capacitor as a capacitance element in the drive circuit, thereby reducing the layout area required for capacitance elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If capacitance elements are provided for each pixel in the drive circuit, then the organic EL element can be driven with stable current control and signal storage, but the layout area of each pixel increases, preventing formation of higher-definition display devices
Solution Approach 1:
The patent merges the capacitance element function with the organic EL element structure by forming the capacitor between the first and second electrodes of the organic EL element itself. This integration eliminates the need for separate capacitance components while maintaining the required electrical storage function for stable current control in the drive circuit.
Solution Approach 2:
The organic EL element structure is given multiple functions: it serves both as the light-emitting component and as the capacitance element for the drive circuit. The region between the electrodes that does not contribute to light emission is utilized to form the capacitor, making the same structural components serve dual purposes.
2Reliability
If multiple capacitance elements are formed on the substrate, then the drive circuit can store signal voltage and compensate for capacitance shortage, but the layout area increases, reducing display definition
Solution Approach 1:
The capacitance element is merged with the organic EL element structure by utilizing the electrode region. The capacitor is formed between the first and second electrodes in the region that does not contribute to light emission, combining the light-emitting function and signal storage function in a single integrated structure.
Solution Approach 2:
The patent utilizes the vertical dimension and unused spatial regions within the existing organic EL element structure. By forming the capacitor between the electrodes in the non-light-emitting region, it exploits the three-dimensional space already allocated for the organic EL element, rather than requiring additional horizontal layout area.
3Area of stationary object
If the layout area for capacitance elements is reduced, then higher-definition display devices can be formed, but the capacitance value may become insufficient for proper drive circuit operation
Solution Approach 1:
The patent applies local quality by utilizing specifically the region between the electrodes that does not contribute to light emission. This localized use of space within the organic EL element structure provides the necessary capacitance function without encroaching on the light-emitting area or requiring additional pixel layout space.
Solution Approach 2:
The solution exploits the vertical and unused spatial dimensions within the existing organic EL element footprint. By forming the capacitor between the electrodes in the non-emissive region, it achieves sufficient capacitance value without increasing the horizontal layout area, enabling higher display definition.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for a reduction in the layout area of each pixel, enabling the creation of higher-definition organic EL display devices by eliminating or reducing the need for auxiliary capacitance components.
Implementation Method 1
The organic EL elements utilize the phenomenon of emitting light when an electric field is applied to an organic thin film
Implementation Method 2
A capacitor is formed between the first and second electrodes in the region that does not contribute to light emission and is used as a capacitance element in a drive circuit for the organic EL element
Data Source
AI summary
An organic EL display device includes organic EL elements provided for respective pixels. Each organic EL element has first and second electrodes between which an organic layer is provided and has a region that contributes to light emission and a region that does not contribute to light emission. A capacitor is formed between the first and second electrodes in the region that does not contribute to light emission and is used as a capacitance element in a drive circuit for the organic EL element.